Affiliation: | 1 Faculty of Informatics, Masaryk University, Botanická 68a, 60200 Brno, Czech Republic. E-mail: tony{at}fi.muni.cz 2 Institute for Informatics, Technical University Munich, Arcisstr. 21, D-80290 Munich, Germany. E-mail: esparza{at}in.tum.de |